The term refers to the culture of leaving work at mid-day, to go to a nearby pub and have a dozen alcoholic drinks or shots, until the evening, before leaving for home. It is also considered common-practice to put the bill on the Corporate Credit Cards.

The term originates in view of the exorbitant, careless, even behaviour usually characterised by bankers and traders, at the expense of their clients. It is also often called a Trader's Dozen.

The opposite of a Baker's Dozen where the customer receives 13 of a product for the price of 12; in a Banker's Dozen the customer receives 11 of the product for the price of 12

Hector was surprised to find only 11 glasses in his gift of 12 glasses that he received from the bank. Later, Hector learned that the Bank offers a Banker's Dozen in their gifts and products, in which they steal one item.